. >> is facebook developing a phone device, like apple did iphone? >> no. we're working on building software that can be used on all phones. >> their latest product is messages, which combines email, cell phone texting, and instant messages into one. they call it the ultimate switchboard. so do you think email will become obsolete? no. >> i'm not sure. but what we've found is that more people are using messages-- are moving away from email. and so if we build a really compelling experience, i think people are going to switch over. but i'm not going to call the end of anything. >> was this directed at gmail? >> no. >> google's email? >> no. >> because everybody's talking about a gmail killer. >> it's certainly what everyone's writing about. >> google... >> yes. >> facebook and google. >> yes. >> are they on a collision course? >> they are indeed. >> the fight's over what? it's over how-- >> search. how people find, discovery, search. >> say you want to buy a car. you can type "prius" on google and get publicly available information. or you can type "prius" o